Sagtikos Manor
Why it's listed
Sagtikos Manor is a sprawling frame house in West Bay Shore, Suffolk County, set on ten acres along Montauk Highway. It began in 1697 as part of a royal patent granted to Stephanus Van Cortlandt, and its oldest section, a one-and-one-half-story timber-framed building, is thought to date from the late seventeenth century. Around the middle of the eighteenth century the Thompson family added a five-bay east wing with a center hall, whose parlor keeps its painted wood paneling. Judge Isaac Thompson, a magistrate, militia organizer and assemblyman, lived here, and British officers and George Washington are recorded as visitors. About 1902 Frederick Diodati Thompson hired Sayville architect Isaac Green, who extended the east wing and added a gambrel-roofed north house in the colonial revival style. The grounds include a carriage house, walled garden and buttery. Its long family ownership and layered growth account for its listing. It operates as a museum.
Significance in brief: The nomination cites its associations with the prominent Carle, Thompson, and Gardiner families of Long Island and its architectural quality. It illustrates estate life and architecture at the turn of the century, when architect Isaac Green redesigned the house in the colonial revival style for Frederick Diodati Thompson. It also shows the periodic expansion of a house over more than two centuries of use by related families.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 76001284, listed November 21, 1976. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | Montauk Hwy. (NY 27A), West Bay Shore |
|---|---|
| County | Suffolk County |
| Listed | November 21, 1976 |
| Reference number | 76001284 |
| Resource type | Building |
| Architect / builder | Isaac Green (20th C. additions) |
| Architectural style | Colonial revival (early twentieth-century additions to an earlier house) |
| Areas of significance | Architecture, Social History |
| Level of significance | State |
| Status (as stated in the nomination) | Occupied and operated as a museum open to the public on a regular seasonal basis; the owner has offered it to Suffolk County, which was studying the proposal. |
| Acreage | 10 |
| Coordinates | 40.70305, -73.27622 (NPS GIS) |
What listing means for this property
National Register listing is honorary for a privately owned home: it does not by itself restrict what an owner may do with their own money, and it does not require public access. Restrictions come from local landmark or historic-district ordinances, which are separate (how they differ).
Owner-occupied houses are not eligible for the 20% federal rehabilitation tax credit, which applies to income-producing buildings, but many states offer credits for homeowners. Listing also opens the door to preservation easements and to buying a plaque. Start with what listing means for homeowners, renovating a listed house and selling one.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 76001284.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7399375
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.